The First Lateran Council, the ninth ecumenical council and the first of the Catholic Church opens in Rome on March 18, 1123. It was convened by Pope Callistus II and it primarily served to formally ratify the Concordat of Worms which ended the investiture controversy.
The Council went on to confirm that only the Church had the authority to bestow spiritual powers on bishops, not secular rulers. It also issued decrees against simony, clerical concubinage, and church robbery, and reaffirmed indulgences for Crusaders.